Jul 30 2013
Topics Covered
Introduction
Chemical Composition
Physical Properties
Mechanical Properties
Thermal Properties
Fabrication and Heat Treatment
Heat Treatment
Aging
Applications
Introduction
Grade Ti 5AI 2Sn 2Zr 4Mo 4Cr alloy is an alpha-beta wrought alloy that has high tensile strength, good fracture toughness, and good crack growth/fatigue resistance.
The following sections will discuss in detail about grade Ti 5AI 2Sn 2Zr 4Mo 4Cr alloy.
Chemical Composition
The chemical composition of grade Ti 5AI 2Sn 2Zr 4Mo 4Cr alloy is outlined in the following table.
|
Element |
Content (%) |
|
Titanium, Ti |
83 |
|
Aluminum, Al |
5 |
|
Molybdenum, Mo |
4 |
|
Chromium, Cr |
4 |
|
Tin, Sn |
2 |
|
Zirconium, Zr |
2 |
|
Iron, Fe |
≤ 0.30 |
|
Oxygen, O |
0.080 - 0.13 |
|
Nitrogen, N |
≤ 0.040 |
|
Hydrogen, H |
≤ 0.0125 |
Physical Properties
The physical properties of grade Ti 5AI 2Sn 2Zr 4Mo 4Cr alloy are tabulated below.
|
Properties |
Metric |
Imperial |
|
Density |
4.65 g/cm3 |
0.168 lb/in3 |
Mechanical Properties
The following table shows mechanical properties of grade Ti 5AI 2Sn 2Zr 4Mo 4Cr alloy.
|
Properties |
Metric |
Imperial |
|
Tensile strength |
1000 MPa |
145000 psi |
|
Yield strength |
1140 MPa |
165000 psi |
|
Poisson's ratio |
0.33 |
0.33 |
|
Elastic modulus |
100-120 GPa |
14503-17404 ksi |
|
Shear modulus |
43.2 GPa |
6270 ksi |
|
Elongation at break |
8% |
8% |
|
Hardness, Brinell |
369 |
369 |
|
Hardness, Knoop |
403 |
403 |
|
Hardness, Rockwell C |
40 |
40 |
|
Hardness, Vickers |
386 |
386 |
Thermal Properties
The thermal properties of grade Ti 5AI 2Sn 2Zr 4Mo 4Cr are tabulated below.
|
Properties |
Metric |
Imperial |
|
Thermal expansion co-efficient (@20-100°C/68-212°F) |
8.50 µm/m°C |
4.72 µin/in°F |
|
Thermal conductivity |
7.80 W/mK |
54.1 BTU in/hr.ft².°F |
Fabrication and Heat Treatment
Heat Treatment
Grade Ti 5AI 2Sn 2Zr 4Mo 4Cr alloy is double solution treated 860ºC (1580°F) for 2h and 800ºC (1472°F) for 4h.
Aging
Grade Ti 5AI 2Sn 2Zr 4Mo 4Cr alloy can be aged at 620ºC (1148°F)for 8h.
Applications
Grade Ti 5AI 2Sn 2Zr 4Mo 4Cr alloy is used in the following application areas:
-
Compressor discs
-
Heavy section forgings for gas turbine engine components.